UMI Precision Trombone Stand The UMI Precision Trombone Stand is one of the most stable instrument stands available Designed to fit all trombone models, the Precision stand features a rubber adjustable height bell cone that will not mar the bell finish, plus wide stance tripod legs with rubber tips to provide extra stability The UMI Precision stand is available in black finish The K&amp;M Precision Trombone Stand is one of the most stable instrument stands available Designed to fit all trombone models, the 14990 Precision stand features a rubber adjustable height bell cone that will not mar the bell finish, plus wide stance tripod legs with rubber tips to provide extra stability